140399890 has 16 divisors (see below), whose sum is σ = 254119320. Its totient is φ = 55848960.

The previous prime is 140399879. The next prime is 140399891. The reversal of 140399890 is 98993041.

It can be written as a sum of positive squares in 4 ways, for example, as 64657681 + 75742209 = 8041^2 + 8703^2 .

It is a super-2 number, since 2×140399890² = 39424258224024200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (140399891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36975 + ... + 40594.

Almost surely, 2^140399890 is an apocalyptic number.

140399890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

140399890 is a deficient number, since it is larger than the sum of its proper divisors (113719430).

140399890 is a wasteful number, since it uses less digits than its factorization.

140399890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77757.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 140399890 is about 11849.0459531559. The cubic root of 140399890 is about 519.7433274690.

The spelling of 140399890 in words is "one hundred forty million, three hundred ninety-nine thousand, eight hundred ninety".